<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片区域 -->
    <el-card>
        <!-- 添加角色按钮区域 -->
        <el-row>
            <el-col>
                <el-button type="primary" @click="addRolesDialogVisible = true">添加角色</el-button>
            </el-col>
        </el-row>
        <!-- 角色列表区域 -->
        <el-table :data="rolelist" border stripe >
            <!-- expand展开列 -->
            <el-table-column type="expand" >
                <template slot-scope="scope">
                    <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id" >
                        <!-- 渲染一级权限 -->
                        <el-col :span="5">
                            <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                            <i class="el-icon-caret-right"></i>
                        </el-col>
                        <!-- 渲染二级权限 --> 
                        <el-col :span="19">
                            <!-- 通过for循环嵌套渲染二级权限 -->
                            <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                                <el-col :span="6">
                                    <el-tag type="success" closable @close="removeRightById(scope.row, item1.id)">{{item2.authName}}</el-tag>
                                    <i class="el-icon-caret-right"></i>
                                </el-col>
                                <el-col :span="18">
                                    <el-tag type="warning" v-for="(item3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                                </el-col>
                            </el-row>
                        </el-col> 
                    </el-row> 
                </template>
            </el-table-column>
            <!-- index索引列 -->
            <el-table-column type="index" ></el-table-column>
            <el-table-column label="角色名称" prop="roleName" ></el-table-column>
            <el-table-column label="角色描述" prop="roleDesc" ></el-table-column>
            <el-table-column label="操作" width="300px">
                <template slot-scope="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.id)">编辑</el-button>
                    <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeRoleById(scope.row.id)">删除</el-button>
                    <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-card>
    <!-- 添加角色对话框 -->     
    <el-dialog 
        title="添加角色"
        :visible.sync="addRolesDialogVisible"
        width="50%"
        @close="addRolesDialogClosed" >
        <!-- 内容区域 -->
        <el-form :model="addForm" ref="addFormRef" :rules="addFormRules" label-width="100px" >
            <el-form-item label="角色ID" prop="roleId">
                <el-input v-model="addForm.roleId"></el-input>
            </el-form-item>
            <el-form-item label="角色名称" prop="roleName">
                <el-input v-model="addForm.roleName"></el-input>
            </el-form-item>
            <el-form-item label="角色描述" >
                <el-input v-model="addForm.roleDesc"></el-input>
            </el-form-item>
        </el-form>
        <!-- 底部区域 -->
        <span slot="footer" class="dialog-footer">
            <el-button @click="addRolesDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addRoles">确 定</el-button>
        </span>
    </el-dialog>

    <!-- 修改角色信息对话框 -->
    <el-dialog
        title="修改角色"
        :visible.sync="editRoleDialogVisible"
        width="50%"
        @close="editDialogClosed"
        >
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
            <el-form-item label="角色ID" >
                <el-input v-model="editForm.roleId" disabled></el-input>
            </el-form-item>
            <el-form-item label="角色名称" prop="roleName">
                <el-input v-model="editForm.roleName"></el-input>
            </el-form-item>
            <el-form-item label="角色描述" prop="roleDesc">
                <el-input v-model="editForm.roleDesc"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editRoleDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editRoleInfo">确 定</el-button>
        </span>
    </el-dialog>

    <!-- 分配权限的对话框 -->
    <el-dialog
        title="分配权限"
        :visible.sync="setRightDialogVisible"
        width="50%"
        @close="setRightDialogClosed"
        >
        <!-- 树形控件 -->
        <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
        <span slot="footer" class="dialog-footer">
            <el-button @click="setRightDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="allotRights">确 定</el-button>
        </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
    data() {
        return {
            // 所有角色列表数据
            rolelist: [],
            // 控制添加角色对话框的显示与隐藏
            addRolesDialogVisible: false,
            // 控制修改角色信息对话框显示与隐藏
            editRoleDialogVisible: false,
            // 控制分配权限对话框的显示与隐藏
            setRightDialogVisible: false,
            // 所有权限的数据
            rightslist: [],
            // 树形控件的属性绑定对象
            treeProps: {
                label: 'authName',
                children: 'children'
            },
            // 当前选中角色的id
            roleId: '',
            // 默认选中已有权限的id值
            defKeys: [],
            // 添加角色表单数据
            addForm: { 
                roleId: '',
                roleName: '',
                roleDesc: ''
            },
            // 添加表单的验证规则对象
            addFormRules: {
              roleId: [
                  { required: true, message: '请输入角色ID', trigger: 'blur' },
              ],
              roleName: [
                  { required: true, message: '请输入角色名称', trigger: 'blur' },
              ]
            },
            // 查询到修改角色信息的数据
            editForm: {},
            // 修改角色信息表单验证规则
            editFormRules: {
                roleName: [
                    { required: true, message: '请输入角色名称', trigger: 'blur' },
                    { min: 1, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                roleDesc: [
                    { required: true, message: '请输入角色名称', trigger: 'blur' },
                    { min: 1, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ]
            }
        }
    },
    created () {
        this.getRolesList()
    },
    methods: {
        // 获取角色列表数据
        async getRolesList() {
            const {data: res} = await this.$http.get('roles')
            if (res.meta.status !== 200) {
                return this.$message.error(res.meta.msg)
            }
            this.rolelist = res.data
        },
        // 监听对话框关闭事件（添加角色）
        addRolesDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        // 提交表单数据（添加角色）
        addRoles() {
            this.$refs.addFormRef.validate(async vaild => {
                // console.log(vaild)
                if (!vaild) return
                const {data: res} = await this.$http.post('roles', {roleName: this.addForm.roleName, roleDesc: this.addForm.roleDesc})
                console.log(res)
                if (res.meta.status !== 201) {
                    return this.$message.error(res.meta.msg)
                }
                this.addRolesDialogVisible = false
                this.$message.success(res.meta.msg)
                this.getRolesList()
            })
        },
        // 展示角色编辑的对话框
        async showEditDialog(id) {
            const {data: res} = await this.$http.get('roles/' + id)
            if (res.meta.status !==200){
                return this.$message.error(res.meta.msg)
            }
            this.$message.success(res.meta.msg)
            this.editForm = res.data
            this.editRoleDialogVisible = true 
        },
        // 监听角色编辑对话框的关闭事件
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 提交角色编辑信息对话框
        editRoleInfo() {
            this.$refs.editFormRef.validate(async vaild => {
                if(!vaild) return
                const {data: res} = await this.$http.put('roles/' + this.editForm.roleId, {roleName: this.editForm.roleName, roleDesc:this.editForm.roleDesc})
                if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
                this.$message.success("修改成功")
                this.editRoleDialogVisible = false
                this.getRolesList()
            })
        },
        // 根据id删除角色事件
        async removeRoleById(id) {
            // console.log(id)
          const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        if (confirmResult !== 'confirm') {
            return this.$message.info('已取消删除')
        }
        const {data: res} = await this.$http.delete('roles/' + id)
        if (res.meta.status !== 200) {
            return this.$message.error(res.meta.msg)
        }
        this.$message.success(res.meta.msg)
        this.getRolesList()
        },
        // 根据id删除对应的权限
        async removeRightById(role, rightId) {
            // 提示用户是否删除该角色
            const confirmResult =  await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            if (confirmResult !== 'confirm') {
                return this.$message.info('已取消删除')
            }
            const {data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if (res.meta.status !== 200) {
                return this.$message.error(res.meta.msg)
            }
            this.$message.success(res.meta.msg)
            // 不建议对整个页面进行刷新
            // this.getRolesList()
            // 将服务器返回的最新权限直接赋值给当前角色的children属性即可
            role.children = res.data
        },
        // 展示分配权限的对话框
        async showSetRightDialog(role) {
            // 获取点击分配权限时对应的角色id
            this.roleId = role.id
            // 获取所有权限的数据
            const {data: res} = await this.$http.get('rights/tree')
            if (res.meta.status !== 200) {
                return this.$message.error(res.meta.msg)
            }
            // 将获取到的数据保存到data中
            this.rightslist = res.data
            // 获取三级权限的id
            this.getLeafKeys(role, this.defKeys)
            this.setRightDialogVisible = true
        },
        // 通过递归的形式，获取角色下三级权限的id值，并保存在defKeys数组中
        getLeafKeys(node, arr) {
            // 如果当前node不包含children，则是三级权限
            if(!node.children) {
                return arr.push(node.id)
            }
            node.children.forEach(item => 
                this.getLeafKeys(item, arr))
        }, 
        // 监听分配权限对话框的关闭事件
        setRightDialogClosed() {
            this.defKeys = []
        },
        // 点击角色权限分配确定按钮获取权限id
        async allotRights() {
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]
            const idStr = keys.join(',')
            const {data: res} = await this.$http.post(`roles/${this.roleId}/rights`, {rids: idStr})
            if (res.meta.status !== 200) {
                return this.$message.error(res.meta.msg)
            }
            this.$message.success(res.meta.msg)
            this.getRolesList()
            this.setRightDialogVisible = false 

        }
    }
}
</script>

<style lang="less" scoped>
.el-tag {
    margin: 7px;
}
.bdtop {
    border-top: 1px solid #eee;
}
.bdbottom {
    border-bottom: 1px solid #eee;
}

.vcenter {
    display: flex;
    align-items: center;
}
</style>